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Acquisitions (Details)
$ in Thousands
12 Months Ended
Jul. 31, 2017
USD ($)
Jan. 30, 2015
shares
Dec. 24, 2014
USD ($)
Sep. 30, 2017
USD ($)
Sep. 30, 2016
USD ($)
Sep. 30, 2015
USD ($)
Business Acquisition [Line Items]            
Net charge       $ 0 $ 0 $ 583
Employee Severance            
Business Acquisition [Line Items]            
Net charge           $ 600
BTU International, Inc (BTU) Merger            
Business Acquisition [Line Items]            
Exchange ratio   0.3291        
SoLayTec, B.V.            
Business Acquisition [Line Items]            
Percentage of voting interests acquired     51.00%      
Purchase price     $ 1,900      
Noncontrolling interest $ 2,700          
Merger Agreement | BTU International, Inc (BTU) Merger            
Business Acquisition [Line Items]            
Percentage of voting interests acquired   100.00%        
The Company | Merger Agreement            
Business Acquisition [Line Items]            
Exchange ratio   0.3291        
BTU International, Inc (BTU) Merger | Merger Agreement            
Business Acquisition [Line Items]            
Conversion of stock, shares issued | shares   3,185,852        
Agreement            
Business Acquisition [Line Items]            
Extinguishment of debt $ 2,400